DÜSSELDORF, Germany — President Donald Trump’s Section 232 tariffs and quotas on imported steel and aluminium from the European Union show no signs of going away soon, according to trade policy and industry experts in Germany.

While Section 232 measures were welcomed by many US steel producers, fears are mounting outside the United States that they could also be applied to automobiles and auto parts.

Any such move would increase tension in relations with EU allies, interviewees in Germany said. Some also see a threat to the World Trade Organization (WTO) and consequently question whether the US is still a reliable trade partner.